JP2825152B2 - Electric drive device such as bed equipped with bottom lifting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric drive device, such as a bed, having a simplified structure, and more particularly to a bed provided with a bottom elevating mechanism applicable to an assembling home bed.

[0002]

2. Description of the Related Art In recent years, the elderly population in Japan has been increasing, and the need for home care beds has increased due to the need for home care. Also, in such home beds,
As with ordinary hospital beds, multifunctionalization and electrification have progressed, and mechanisms for adjusting back and forth, and raising and lowering the frame by electric power have been provided. By the way, since the home bed is used in ordinary households, it is desirable to use an assembling bed that can be packed small so that the package is not bulky and can be easily carried indoors. On the other hand, in the case of the assembling type, it takes time and effort to assemble, and since the assembling is performed with reference to the instruction manual, it is complicated, and tools are often required depending on the assembling location.

The applicant has commercialized a home bed 1 as shown in FIG. 8 (Japanese Patent Laid-Open No. 7-124201).
Reference). That is, in the home bed 1, the frame 2 is divided into three parts (the head frame 2a, the waist frame 2b).
The head board 3 and the foot board 4 are detachably attached to the frame 2 and the bottom 5 is divided into the leg side frame 2c), and the back is raised and the knee is raised by a back raising mechanism and a knee raising mechanism (not shown). It is what it was. The home bed 1 is configured to adjust the frame 2 and the bottom 5 up and down by the following configuration. That is, the upper end of the head-side frame 2a and the leg-side frame 2c constituting the frame 2 are moved along the guide rails 6 and 7 provided on the frames 2a and 2c via the rollers 8 and 9, respectively. Undulating leg member 1
Reference numerals 0 and 11 are attached, and the intermediate portions of the undulating leg members 10 and 11 are connected by auxiliary stays 12 and 13 so as to assist the operation of the undulating leg members 10 and 11. The screw shafts 16 and 17 are screwed into the female screw members 14 and 15 and the female screw members 14 and 15 respectively on the undulating leg members 10 and 11, and the screw shafts 16 and 17 are connected to the connecting pipes 18 and 19 by connecting rods. By connecting 20, it is possible to interlock. A motor 23 is connected to the end of the screw shaft 16 via a bearing member 21 receiving a load and a shaft joint 22. The motor 23 is mounted on a motor mounting bracket 24 protruding from the frame 2, and also on the bearing member 21 on a bearing member mounting bracket 25 protruding from the frame 2. Further, as shown in FIG. 9, the motor 23 inserts the spacer member 26 into an insertion hole 24a formed at the end of the motor mounting bracket 24, and
A stepped bolt 27 is rotatably inserted into and supported to be displaceable.

[0004]

According to such a structure, the bearing member mounting bracket 25 supporting the bearing member 21, the bearing member mounting bolt 28, and the motor mounting bracket 24 supporting the motor 23 are stepped. Simply attach the motor 2 to the end of the screw shaft 16 such as the bolt 27.
3 requires a plurality of brackets and a large number of bolts, and requires a shaft joint 22 so as not to be easily affected by displacement of the shaft center. This leads to an increase in the number of assembly steps. The present invention has been proposed in order to improve such inconvenience, and an object of the present invention is to provide an electric drive device having a simplified configuration, particularly a bed or the like having a bottom elevating mechanism.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a bed or the like having a bottom elevating mechanism, which comprises a frame on the head side, a frame corresponding to the waist, and a frame on the leg side. The head frame and the leg frame are mounted on the head-side frame and the leg-side frame such that the upper end moves along rollers provided on the head-side frame and the leg-side frame via rollers. Since the head side frame and the leg side frame end side are connected by an auxiliary stay to assist in regulating the operation of the up / down leg members, the up / down leg members are reversely threaded at locations close to the guide rails. Attach the screw members, screw the screw shafts to these female screw members, connect the screw shafts so as to be able to interlock with each other, and on one side of the screw shaft via a bearing By connecting the motor to with reduction mechanism attached fast mechanism, while constituting the electric driving unit which integrally built structure, on the other side of the screw shaft,
A driven unit having a built-in bearing is configured, and the electric drive unit and the driven unit are mounted on the frame by one mounting member.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an assembling type home bed to which an electric drive device for a bottom lifting mechanism according to the present invention is applied will be described with reference to the accompanying drawings. FIG. 1 shows an assembling type home bed 30. The bed 30 is configured such that the frame 31 is divided into three parts, the headboard 32 and the footboard 33 are detachable from the frame 31, and the bottom 34 is divided into three parts. It is configured to perform the raising. The three-divided frame 31 is constituted by a head-side frame 31a to which a headboard 32 is attached, a waist frame 31b located at the center corresponding to the waist, and a leg-side frame 31c to which a footboard 33 is attached. . The waist frame 31b located at the central portion has both ends at the head side frame 31a,
It is configured to be inserted and connected to the leg side frame 31c (see FIG. 2).

In such a frame 31, the bed 30
In the head side frame 31a and the leg side frame 31c,
Up and down leg members 39 and 40 are mounted so that the upper ends move via rollers 37 and 38 along guide rails 35 and 36 provided on the frames 31a and 31c, respectively, and intermediate portions between the up and down leg members 39 and 40. And head side frame 31a
And an auxiliary stay 41 with the end of the leg side frame 31c.
The movement of the up-and-down leg members 39 and 40 is auxiliary-regulated by being connected by 42.

[0008] Screw members 43 and 44 are screwed in opposite positions to the guide rails 35 and 36 of the undulating leg members 39 and 40, and screw shafts 45 and 46 are screwed respectively. Have been. These screw shafts 45 and 46 are configured to be interlockable by connecting a connecting rod 49 via connecting pipes 47 and 48 attached to end portions facing each other. Then, the connection pipe 47 of the screw shaft 45 on the head-side frame 31a side is used.
At the end opposite to the end where the
An electric drive unit 50 containing a motor (to be described later), which is a driving means for the motors 5 and 46, is mounted via a mounting bracket 51. On the other hand, a driven unit 52 having a built-in bearing (described later) is attached to an end of the screw shaft 46 on the leg side frame 31c opposite to the end to which the connecting pipe 48 is attached. 52
Is supported by the leg side frame 31c via a mounting bracket 53.

Next, the connecting rod 49 to the connecting pipes 47 and 48, which are means for connecting the screw shafts 45 and 46, will be described in more detail. That is, the screw shaft 4
As shown in FIG. 3, connection pipes 47 and 48 are fitted into the ends 5 and 46 facing each other and fixed by pin members 54 and 55. And these connecting pipes 47, 48
The both ends of the connecting rod 49 are respectively inserted into the connecting rod 49, and the connecting rod 49 is
Is fixed so that it does not fall off. The connection pipes 47 and 48 have a hexagonal inner surface, while the connection rod 49 has a hexagonal outer periphery. Also,
The connecting pipe 47 is formed with a cut groove 57 for locking the retaining means 56. The connecting rod 49 inserted into the connecting pipe 47 is provided with a constricted portion 58 whose diameter is smaller than the diameter of the connecting rod 49 at another position (see FIG. 4). The retaining means 56 includes a stopper shaft 59 that engages with the constricted portion 58 of the connecting rod 49 via the connecting pipe 47, and a loop-shaped coil spring 60 connected to both ends of the stopper shaft 59 ( (See FIG. 5).

As shown in FIG. 6, the electric drive unit 50 includes a bearing housing 63 for accommodating a bearing (described later) for connecting the screw shaft 45 and the motor 61 via a speed reduction mechanism 62, and a motor housing 64. And a cover member 65 for covering the screw shaft 45 is fitted to the open end surface of the bearing housing 63, and the mounting bracket 51 is screwed into a screw hole 66 provided in the bearing housing 63. It is supported by that. The screw member 43 for screwing with the screw shaft 45 is provided with a screw hole 67 for screwing and fixing the screw member 43 to the undulating leg member 39. The screw shaft 45 penetrates through the stopper 68 at the connection point between the bearing housing 63 and the cover member 65, while being inserted into the first bearing 69 a in the bearing housing 63 and the second bearing 69.
b, the bevel gear 70a constituting the reduction mechanism 62
It is attached to. Power is transmitted to the bevel gear 70a from a bevel gear 70b attached to the output shaft of the motor 61 built in the motor housing 64. The motor 61 is connected to the motor housing 6.
4, the structure is supported by mount rubbers 71 and 72.

On the other hand, the driven unit 52 mounted on the leg side frame 31c by the mounting bracket 53
As shown in FIG. 7, a cover member 74 for covering the screw shaft 46 is fitted into a bearing housing 73 in which a bearing (described later) for supporting the screw shaft 46 is built. The mounting bracket 53 is screwed into the screw hole 75 provided in the bracket.
The screw member 44 for screwing with the screw shaft 46 includes:
A screw hole 76 for screwing and fixing to the undulating leg member 39 is threaded. In the bearing housing 73, the screw shaft 46 is inserted through the first bearing 78a via the stopper 77, and is rotatably supported by the second bearing 78b.

When assembling the bed 30 having the bottom elevating mechanism constructed as described above, first, insert both ends of the frame 31b located at the center into the head-side frame 31a and the leg-side frame 31c, respectively. Connect with. Next, the head side frame 31a and the leg side frame 3
Screw shafts 45 and 46 for driving the undulating leg members 39 and 40 on the 1c side are connected by connecting rods 49. At this time, both ends of the connecting rod 49 are inserted into the connecting pipes 47 and 48 at the ends of the screw shafts 45 and 46 facing each other, and the connecting rod 49 is fixed by the retaining means 56 provided on the connecting pipe 47 side. . That is, the connecting rod 49 inserted into the connecting pipe 47 is fixed to the constricted portion 58 of the connecting rod 49 via the connecting pipe 47 by engaging the stopper shaft 59 with the spring force of the loop coil spring 60. it can. Then, the head board 32, the foot board 33, and the bottom 34 are mounted, and the assembly is completed. Since the bed 30 can be assembled in this manner, no tools are required.

The electric drive unit 50 has a first bearing 69a and a second bearing 69b for supporting the screw shaft 45 by mounting a cover member 65 on an integral bearing housing 63 and motor housing 64. Because of the unit structure described above, it can be made compact and accurate with respect to manufacturing, and the assembling process to the bed can be simplified.

Next, the operation of the bottom lifting mechanism will be described.
When the motor 61 is started, the screw shaft 45 of the head-side frame 31a rotates, and this rotational force is transmitted to the screw shaft 46 of the leg-side frame 31c via the connecting rod 49, and rotates in the same direction. Since the screw shafts 45 and 46 are threaded in opposite directions, the female screw members 43 and 4
4 move on the screw shafts 45, 46 so as to move away from or approach each other. As a result, the upper ends of the undulating leg members 39, 40 move toward or away from each other via the rollers 37, 38 along the guide rails 35, 36 of the frames 31a, 31c, and the auxiliary stay 4
Due to the auxiliary restricting action of 1, 42, the undulating leg members 39, 40
Performs an undulating operation, so that the bottom 34 can be moved up and down (see FIG. 1).

As described above, the bottom lifting mechanism is
Since the up-and-down leg members 39 and 40 and the auxiliary stays 41 and 42 of both the head-side and leg-side frames 31a and 31c are linked by one motor 61, the mechanism can be simplified. Further, if the screw shafts 45 and 46 for driving the undulating leg members 39 and 40 on the side of the head-side frame 31a and the leg-side frame 31c are connected by the connecting rod 49, the present invention can be applied to an assembling type home bed. can do. Also, no tools are required during assembly,
Assembly work becomes easy.

[0016]

As described above, according to the present invention, since the up-and-down leg members and the auxiliary stays of both the head side frame and the leg side frame are linked by one driving means, the mechanism can be simplified. It is. Furthermore, since the periphery of the motor, which is the drive source, is unitized as an electric drive unit,
The number of assembly steps can be reduced, and the manufacturing cost can be reduced.

[0017]

[Brief description of the drawings]

FIG. 1 is a schematic side view illustrating an example of a bed to which a bottom lifting mechanism according to the present invention is applied.

FIG. 2 is an exploded side view illustrating a configuration of the bed illustrated in FIG. 1;

FIG. 3 is an enlarged sectional explanatory view showing a connection structure of a screw shaft constituting a bottom elevating mechanism in the bed shown in FIGS. 1 and 2;

FIG. 4 is an explanatory perspective view of a main part configuration showing details of a connection structure shown in FIG. 3;

FIG. 5 is an exploded view for explaining a main part of the connection structure shown in FIG. 4;

FIG. 6 is a schematic sectional explanatory view of an electric drive unit in the bottom elevating mechanism according to the present invention.

FIG. 7 is a schematic sectional explanatory view of a driven unit of the electric drive unit in the bottom lifting mechanism according to the present invention.

FIG. 8 is a schematic side view showing an example of a current assembling type home bed;

FIG. 9 is an exploded perspective view showing a mounting structure around a driving motor of the home bed shown in FIG. 8;

[Explanation of symbols]

 Reference Signs List 30 Bed 31 Frame 31a Head side frame 31b Waist frame 31c Leg side frame 32 Headboard 33 Footboard 34 Bottom 35, 36 Guide rail 37, 38 Roller 39, 40 Undulating leg member 41, 42 Auxiliary stay 43, 44 Female thread member 45, 46 Screw shaft 47, 48 Connecting pipe 49 Connecting rod 50 Electric drive unit 51, 53 Mounting bracket 52 Follower unit 54, 55 Pin member 56 Retaining means 57 Cut groove 58 Constricted portion 59 Stopper shaft 60 Coil Spring 61 Motor 62 Reduction mechanism 63 Bearing housing 64 Motor housing 65 Cover member 66, 67 Screw hole 68 Stopper 69a First bearing 69b Second bearing 70a Bevel gear 70b Bevel gear 71, 72 Mounting rubber 73 Bearing C Managing 74 cover member 75 screw hole 77 stopper 78a first bearing 78b second bearing

Claims (1)

(57) [Claims] 1. In a bed or the like having a bottom elevating mechanism, a frame is divided into a head-side frame, a frame corresponding to a waist, and a leg-side frame. An up-and-down leg member is mounted so that the upper end moves along the provided guide rail via a roller, and an intermediate portion of the up-and-down leg member is connected to an end of the head-side frame and the leg-side frame by an auxiliary stay. As a configuration for assisting the operation of the undulating leg members, a screw member is screwed in the opposite direction to the guide rail of each of these undulating leg members, and a screw shaft is screwed to these internal thread members. Then, the screw shafts are operably connected to each other, and a reduction mechanism is attached to one side of the screw shaft via a bearing, and a motor is connected to the reduction mechanism. On the other side of the screw shaft, while constituting the electric drive unit which is physically built in,
An electrically driven unit such as a bed equipped with a bottom elevating mechanism, wherein a driven unit having a built-in bearing is configured, and the electric drive unit and the driven unit are each mounted on a frame by one mounting member. apparatus.